I'm no expert, but just finished taking off a 1979 44 oiler to see if the cam screw was colored (see Husky 44 too much oil). The diagram for the 83 is here --
http://weborder.husqvarna.com/order_static/doc/HIPL/HIPL1983/HIPL1983_I8300010.pdf
The washer on the 79 model looked like it was locked on or just part of the shaft, but it wasn't. While removing the 3 screws that hold the oiler, I noticed two different threaded holes that are on opposite sides of the shaft. I placed 2 of the screws in those holes and used the claws of a hammer to gently pry each side up, a bit at the time. You could probably use a puller, but the hammer worked for me -- no problem is too big if you have a big enough hammer.
Good luck with it. After a little work the 79 model I was tinkering with runs like a screamin ....